diff --git a/setup.py b/setup.py
index e62010f..445936c 100644
--- a/setup.py
+++ b/setup.py
@@ -219,7 +219,6 @@ module_pEp = Extension(
                 'src/pEp/native_pEp/message_api.cc',
                 'src/pEp/native_pEp/str_attr.cc',
                 'src/pEp/native_pEp/user_interface.cc',
-                # 'src/adapter.cc'
                 ],
 )
 
diff --git a/src/pEp/native_pEp/adapter.cc b/src/pEp/native_pEp/adapter.cc
deleted file mode 100644
index 6bc1c4f..0000000
--- a/src/pEp/native_pEp/adapter.cc
+++ /dev/null
@@ -1,99 +0,0 @@
-// This file is under GNU Affero General Public License 3.0
-// see LICENSE.txt
-
-#include "user_interface.hh"
-#include <assert.h>
-#include "adapter.hh"
-
-namespace pEp {
-    namespace PythonAdapter {
-        Adapter::Adapter(bool unregister_this)
-            : flag_unregister(unregister_this)
-        {
-            session(init);
-        }
-
-        Adapter::~Adapter()
-        {
-            session(release);
-        }
-
-        PEP_SESSION Adapter::session(session_action action)
-        {
-            lock_guard<mutex> lock(mtx());
-
-            thread_local static PEP_SESSION _session = nullptr;
-            thread_local int booked = 0;
-            PEP_STATUS status = PEP_STATUS_OK;
-
-            switch (action) {
-                case release:
-                    if (booked)
-                        --booked;
-                    if (!booked && _session) {
-                        ::release(_session);
-                        _session = nullptr;
-                    }
-                    break;
-
-                case none:
-                    if (_session)
-                        break;
-
-                case init:
-                    ++booked;
-                    if (!_session)
-//                        status = ::init(&_session, _messageToSend, _inject_sync_event, _ensure_passphrase);
-//                        status = ::init(&_session, _messageToSend, _inject_sync_event);
-                    break;
-
-                default:
-                    status = PEP_ILLEGAL_VALUE;
-            }
-
-            if (status)
-                _throw_status(status);
-
-            return _session;
-        }
-
-        ::utility::locked_queue< SYNC_EVENT > * Adapter::q = nullptr;
-        bool Adapter::flag_sync_enabled = false;
-
-        void Adapter::shutdown_sync()
-        {
-            if (queue_active())
-                queue().push_front(nullptr);
-            flag_sync_enabled = false;
-        }
-
-        PyObject *Adapter::ui_object(PyObject *value)
-        {
-            lock_guard<mutex> lock(mtx());
-            static PyObject *obj = nullptr;
-            if (value)
-                obj = value;
-            return obj;
-        }
-
-//        int Adapter::_inject_sync_event(SYNC_EVENT ev, void *management)
-//        {
-//            if (!flag_sync_enabled)
-//                return 1;
-//
-//            if (is_sync_thread(adapter.session())) {
-//                PEP_STATUS status = do_sync_protocol_step(adapter.session(), adapter.ui_object(), ev);
-//                return status == PEP_STATUS_OK ? 0 : 1;
-//            }
-//
-//            try {
-//                queue().push_back(ev);
-//            }
-//            catch (exception&) {
-//                return 1;
-//            }
-//            return 0;
-//        }
-    }
-}
-
diff --git a/src/pEp/native_pEp/adapter.hh b/src/pEp/native_pEp/adapter.hh
deleted file mode 100644
index 634e65c..0000000
--- a/src/pEp/native_pEp/adapter.hh
+++ /dev/null
@@ -1,59 +0,0 @@
-// This file is under GNU Affero General Public License 3.0
-// see LICENSE.txt
-
-#pragma once
-
-#include "pEpmodule.hh"
-#include "pEp/locked_queue.hh"
-#include "user_interface.hh"
-#include <pEp/sync_api.h>
-
-namespace pEp {
-    namespace PythonAdapter {
-        using Message = pEp::PythonAdapter::Message;
-
-        class Adapter {
-                bool flag_unregister;
-
-            public:
-                Adapter(bool unregister_this = false);
-                virtual ~Adapter();
-
-                enum session_action {
-                    none = 0,
-                    init,
-                    release
-                };
-
-                PEP_SESSION session(session_action action = none);
-                static ::utility::locked_queue< SYNC_EVENT >& queue()
-                {
-                    if (!q)
-                        q = new ::utility::locked_queue< SYNC_EVENT >();
-                    return *q;
-                }
-                void script_is_implementing_sync() { flag_sync_enabled = true; }
-                void shutdown_sync();
-                bool is_sync_active() { return flag_sync_enabled; }
-
-            protected:
-                static PyObject *ui_object(PyObject *value = nullptr);
-                static int _inject_sync_event(SYNC_EVENT ev, void *management);
-
-                static ::utility::locked_queue< SYNC_EVENT > *q;
-                static bool flag_sync_enabled;
-
-                bool queue_active() { return !!q; }
-
-            private:
-                static mutex& mtx()
-                {
-                    static mutex m;
-                    return m;
-                }
-
-            friend class UserInterface_callback;
-        };
-    }
-}
-
diff --git a/src/pEp/native_pEp/locked_queue.hh b/src/pEp/native_pEp/locked_queue.hh
deleted file mode 100644
index 88c7430..0000000
--- a/src/pEp/native_pEp/locked_queue.hh
+++ /dev/null
@@ -1,61 +0,0 @@
-#pragma once
-
-#include <list>
-#include <mutex>
-
-namespace utility
-{
-    using namespace std;
-
-    template<class T> class locked_queue
-    {
-        mutex _mtx;
-        list<T> _q;
-
-    public:
-        T& back()
-        {
-            lock_guard<mutex> lg(_mtx);
-            return _q.back();
-        }
-        T& front()
-        {
-            lock_guard<mutex> lg(_mtx);
-            return _q.front();
-        }
-        T pop_back()
-        {
-            lock_guard<mutex> lg(_mtx);
-            T r = _q.back();
-            _q.pop_back();
-            return r;
-        }
-        T pop_front()
-        {
-            lock_guard<mutex> lg(_mtx);
-            T r = _q.front();
-            _q.pop_front();
-            return r;
-        }
-        void push_back(const T& data)
-        {
-            lock_guard<mutex> lg(_mtx);
-            _q.push_back(data);
-        }
-        void push_front(const T& data)
-        {
-            lock_guard<mutex> lg(_mtx);
-            _q.push_front(data);
-        }
-        size_t size()
-        {
-            lock_guard<mutex> lg(_mtx);
-            return _q.size();
-        }
-        bool empty()
-        {
-            lock_guard<mutex> lg(_mtx);
-            return _q.empty();
-        }
-    };
-};